Electric stop motion for looms



5am@ 23, E936, v MORlN 45,364-

ELECTRIG Y STOP MOTION FOR LOOMS Filed Dec. 20, 1935 Patented June 23, 1936 UNITED 3;;

6 Claims.

This invention relates to certain new and useful improvements in electric stop motion for looms, of the general type disclosed in Patent 1,959,243, granted to John Lambert on May 15,

1934 andY embodies improvements in the art thereover.

4While the invention disclosed herein is primarily intended as an electrical stop motion for looms that is rendered operable when foreign 10 lmatter, such as floats appear on warp threads, the same is also applicable to any type of textile machinery wherein a harness bar or lease rodr is used, such as slashers, Warpers, beamers and the like.

The primary object `of this invention relates to a heddle bar that functions as a detector of foreign matter appearing on warp threads, such as floats with the heddle bar operated under the influence of the heddle wires to render electrical Y devices operative on the stop motion for a loom.

A further object of the invention is to provide a heddle bar with cooperating electric contacts that are normally separated by spacedV cushion blocks that are adapted to be compressed by one Y of the contacts to permit engagement of the contacts when 'oats or other foreign matter appear on the warp threads.

Withlthe above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in the novelform, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawingz- Figure 1 is a side elevational view, partly broken away and shown in section of a heddle bar constructed in accordance with the present invention and showing the two electrical contacts normally separated by interposed cushion or rubber blocks;

Figure 2 is a side elevational View, similar to Figure 1, with the resilient contact bar shifted by a heddle wire for compression of a rubber block and engaged between the two contacts for operating the electrical stop motion for the loom;

Figure 3 is a cross-sectional view taken on line 3-3 of Figure 1,'

Figure 4 is a cross-sectional View taken on line 4-4 of Figure 1, showing the contacts separated by the interposed rubber blocks;

Figure 5 is a fragmentary side elevational View of the resilient contact bar;

Figure 6 is a fragmentary side elevational view of the rigid contact bar having a cut-out or seat therein for reception of the rubber block spacer; and

Figure 7 is a fragmentary side elevational view, partly in section of the journal support and insulation liner for the rigid contact strip. 5 The heddle bardesignated in general by the reference character I0 comprises a trough member of U-shape in cross-section having side walls II and a bottom wall I2. A rigid contact strip and support therefor are mounted in the trough 10 and comprise a channel member I3 of U-shape seated on the bottom wall 'I2 of the troughwith an insulation liner Ill in the channel member that directly receives the contact strip I 5, the

upper edge of which projects above theichannel l5 member I3 and insulation liner Ill as clearly illustrated in Figure 3. l

The channel support, insulation liner and contact strip are cut-away atv suitably spaced points as shown'in Figures 1, 2,76 and' to provide recesses or seats I6 for the reception'of elastic rubber or cushion blocks vI'l that project above the upper edge of the contact strip- I l The other section of the heddle bar comprises a resilient contact strip I 8 that carries a con- 25Y tinuous series of substantially segment-shaped laterally directed contact fingers I9 that normally'extend downwardly between theside walls II of the trough. The fingers of the resilient contact strip I8., in transverse alignment with 30' the rubber blocks Il are substantially .roundedV at their lower ends as at lila for morek effective cooperation with the rubber blocks while the free ends of the remaining contact fingers Ill arecut on straight lines. 5f'.

The resilient strip I8 and the rigid strip I5 constitute electrical contacts that permit the ow of electrical current tothe magnet on a loom with the magnet operating an electrical stop motion. The normal positions of the contact strips I8 and 40 I5 are illustrated in Figure 1, the rubber blocks I 'I projecting above the rigid Contact strip I 5 for holding the contact fingers I9 spaced from the contact strip I5. Heddle wires are associated with the heddle bar in the usual manner and 45 when a float or other foreign substance appears on a warp thread, a strain is exerted on the heddle wire for moving the resilient contact strip I8 against pressure exerted by the rubber blocks I'I to assume the position shown at 20 in Figure 2, 50 the contact fingers i9 at each side of the finger that engages the rubber block engages the contact strip i5 for closing an electric circuit for the operation of the electrical stop motion for the loom. When tension on the heddle wire is re- 55 lieved, the compressed rubber block I1 expands to raise the contact strip I8 and separate the contact fingers I9 from the contact strip I5.

From the above detailed description of the invention, it is believed that the construction and operation thereof will at once be apparent, it being noted that the rubber blocks I1 for normally spacing the contact strips I8 and I5 may be arranged the desired distances apart, the. blocks may be readily replaced and the cost of manufacture of such detectors is greatly reduced, while y the construction thereof is simplified.

While there is herein shown and described the preferred embodiment of the invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

I claim:-

1. Means for operating a warp stop motion for looms, comprising a heddle bar and associated heddle wire and said heddle bar being constructed and arranged for closing an electrical circuit by distortion of the heddle wire, the heddle bar including a rigid contact strip and a resilient contact strip normally spaced from the rigid contact strip and cushion blocks interposed between the contact strips and constituting a support for the resilient contact strip for holding the contact strips in inoperative separated positions and adapted to be compressed by movement of the resilient contact strip towards the rigid contact strip for the closing of the circuit.

2. Means for operating a warp stop motion for looms, comprising a heddle bar and associated heddle wire and said heddle bar being constructed and arranged for closing an electrical circuit by distortion of the heddle wire, the heddle bar including a rigid contact strip and a resilient contact strip normally spaced from the rigid contact strip and cushion blocks interposed between the contact strips and constituting a support for the resilient contact strip for holding the convtact strips in inoperative separated positions and adapted to be compressed by movement of the resilient contact strip towards the rigid contact strip for the closing of the circuit, the resilient contact strip comprising a series of contact fingers with a nger associated with each cushion block.

3. Means for operating a warp stop motion for looms, comprising a heddle bar and associated heddle wire and said heddle bar being constructed and arranged for closing an electrical circuit by distortion of the heddle wire, the heddle bar including a rigid contact strip and a resilient contact strip normally spaced from` the rigid contact strip and cushion blocks interposed between the contact strips and constituting a support for the resilient contact strip for holding the contact strips in inoperative separated positions and adapted to be compressed by movement of the resilient contact strip towards the rigid contact strip for the closing of the circuit, and the rigid contact strip having spaced cut-outs therein forming seats for the cushion blocks with the latter projecting upwardly above the rigid contact strip.

4. Means for operating a warp stop motion for looms, comprising a heddle bar and associated heddle wire and said heddle bar being constructed and arranged for closing an electrical circuit by distortion of the heddle wire, the heddle bar including a rigid contact strip and a resilient Contact strip normally spaced from the rigid contact strip and cushion blocks interposed between the contact strips and constituting a support for the resilient contact strip for holding the contact strips in inoperative separated positions and adapted to be compressed by movement of the resilient contact strip towards the rigid contact strip for the closing of the circuit, the resilient contact strip comprising a series of contact ngers with a finger associated with each cushion block, and the rigid contact strip having spaced cut-outs therein forming seats for the cushion blocks with the latter projecting upwardly above the rigid contact strip.

5. Means for operating a warp stop motion for looms comprising a heddle bar having normally spaced contact strips, rubber blocks interposed between the contact strips for holding them in spaced relation and constituting a support for one of the contact strips and one of the contact strips being resilient whereby pressure exerted thereon will eiect flexure of the same and compression of the rubber blocks to cause engagement of the contact strips for closing an electrical circuit for roperation of the warp stop motion.

6. Means for operating a warp stop motion for looms comprising a heddle bar having normally spaced contact strips, rubber blocks interposed between the contact strips for holding them in spaced relation and one of the contact strips being resilient whereby pressure exerted thereon will eiect flexure of the same and compression of the rubber blocks to cause engagement of the contact strips for closing an electrical circuit for operation of the warp stop motion, the resilient contact strip including a series of contact ngers with a finger associated with each rubber spacer block.

GEORGE V. MORIN. 

